Selection from Arcana Cœlestia ~ Emanuel Swedenborg
The natural subsists and lives by virtue of influx from the internal, that is, through the internal from the Lord. For without influx thence the natural has no life, because it [the natural] is in the nature of this world, and from this derives all that it has. The nature of this world is utterly devoid of life; and therefore in order that the natural with man may live, there must be influx from the Lord, not only immediate from Him, but also mediate through the spiritual world, consequently into man's internal, for this is in the spiritual world. Then from this there must be influx into the natural, in order that this may live. The natural of man is formed to receive life therefrom. ... By virtue of influx from the internal there comes forth perception in the external or natural ... for influx and perception correspond to each other.
(from Arcana Cœlestia 6063)